Abrasive tool making process – material – or composition – With inorganic material
Reexamination Certificate
2005-06-23
2011-10-25
McDonough, James (Department: 1731)
Abrasive tool making process, material, or composition
With inorganic material
C051S293000, C051S309000
Reexamination Certificate
active
08043392
ABSTRACT:
The mixture of molten alumina-zircon grains has the following chemical composition in percentage by weight to give 100%: 40-45.5% ZrO+HfO2; 46-58% Al2O3; 0-10% additive; <0.8% SIO2and <1,2% impurities. The mixture is characterised in that the degree of impurity-containing grains is less than 2% and the nodule concentration measured on the section of any grain of the mixture is greater than 500 nodules per mm2in at least 50% of cases.
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McDonough James
Saint Gobain Centre de Recherches et d'Etudes European
Young & Thompson
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